Adaptive model of DOM dynamics in the surface ocean

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ID: 305374
2003
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Abstract
The bulk of marine dissolved organic matter (DOM) forms a large, old, refractory carbon pool in the deep ocean, yet a small fraction in the surface ocean is actively involved in the global carbon cycle and may contribute signi cantly to the biological pump.We argue that present models of plankton and DOM in the surface ocean are incompatible with current knowledge of marine DOM dynamics.We present a plankton model with an adaptive formulation of bacteria-DOM interactions which is more consistent with observations.Our model reproduces net accumulation of DOM and is the rst to reconcile the prevailing reports of net consumption of inorganic nitrogen by bacteria with commonly found DOC:DON ratios in the surface ocean.Our model predicts that factors governing DOM production by phytoplankton and zooplankton have little in uence on DOM accumulation in the surface ocean.Long-term accumulation, eventual export of DOM, and hence its contribution to the biological pump appear to be primarily controlled by characteristics of bacterial DOM utilization.The model implies a negative relation between temperature and DOM accumulation,which can be obscured, however, by the impact of temperature on water-column stability.On longer time scales, this negative relation could indicate a positive feedback between temperature and CO 2 .DOM can accumulate independently of inorganic nutrient content of the surface ocean.Therefore, the predicted positive feedback is potentially very strong and could help explain the large variations in atmospheric CO 2 between glacial and interglacial periods.
Reference Key
openalex_W2144110473 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Markus Pahlow, Alain Vézina
Journal journal of marine research
Year 2003
DOI
10.1357/002224003321586435
URL
https://doi.org/10.1357/002224003321586435
Keywords Keywords not found

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